Matrix Backlight Unit Row Column Driving Signals
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Solution Overview
Problem
The existing localized dimming methods for liquid crystal display (LCD) devices increase manufacturing costs due to the need for additional driving circuits to adjust illumination per block, which is not efficiently managed in current backlight units.
Innovation Solution
A backlight unit with a matrix-shaped block structure, where each block includes a light-emitting diode module, and a driver system using shared row and column driving signals to adjust luminance, reducing the number of required driving circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If additional driving circuits are added to adjust illumination per block in localized dimming methods, then image quality and contrast ratio are improved, but manufacturing costs increase
Solution Approach 1:
The patent merges the driving functions by combining row and column driving signals to control LED blocks. Instead of having separate driving circuits for each block, the system uses a matrix addressing scheme where blocks are driven by the intersection of row and column signals, reducing the total number of driving circuits required while maintaining per-block illumination control capability
Solution Approach 2:
The driving circuits are designed with multi-functionality to handle both row and column addressing operations. The same driving circuit infrastructure serves multiple purposes by time-division or signal-division multiplexing, allowing a single circuit to control multiple LED blocks through different signal combinations
2Manufacturing precision
If additional driving circuits are added to adjust illumination per block, then contrast ratio is improved, but device complexity increases
Solution Approach 1:
The patent segments the LED backlight into a matrix of controllable blocks, where each block can be independently addressed through row and column signal combinations. This segmentation allows for localized dimming control while using a systematic addressing scheme that reduces the overall complexity of the driving circuit architecture
Solution Approach 2:
The patent transitions from a one-to-one mapping between driving circuits and LED blocks to a two-dimensional matrix addressing system. By adding the dimension of signal multiplexing and time-division, the system achieves per-block control with fewer physical circuits, reducing device complexity
3Use of energy by moving object
If illumination is adjusted per block according to image information, then power consumption is decreased, but device complexity increases
Solution Approach 1:
The patent implements dynamic illumination control where LED block brightness is adjusted in real-time based on image content analysis. The system dynamically determines which blocks need illumination and at what intensity levels, enabling power savings while maintaining image quality through adaptive rather than static lighting control
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces manufacturing costs and power consumption by minimizing the number of driving circuits while maintaining image quality and contrast ratio.
Implementation Method 1
Each block includes a light emitting diode module
Data Source
AI summary
A backlight unit of a liquid crystal display device supplies light to one or more corresponding pixels of a liquid crystal display panel. The backlight unit includes a plurality of blocks formed into a matrix shape. Each block includes a light emitting diode module. The blocks in a row of the matrix are driven by a same row driving signal and the blocks in a column of the matrix are driven by a same column driving signal, to adjust luminance of the light supplied to the corresponding pixels.